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【简答题】
Do you like chocolate? Maybe most people do. A box of it can be a great gift. Buy one for a friend and give it as a surprise. See how happy that person is. Say you just got a box of chocolate. Which piece do you pick first? A man has studied people's choices. He says they tell something about the person. Did you choose a round piece? You are a person who likes to party. Did you choose an oval ( 椭圆形的 ) shape? You are a person who likes to make things. Picking a square shape shows something else. The person is honest and truthful. You can depend on (依赖) him or her. What kind of chocolate do you pick? Maybe you like milk chocolate. This shows you have warm feelings about the past. Dark chocolate means something else. A person who chooses it looks toward the future. What about white chocolate? Would you choose it? If so, you may find it hard to make up your mind. Some people like chocolate with nuts. These are people who like to help others. Do you believe these ideas? Can candy tell all these things? It doesn't really matter. There is one sure thing about eaters of chocolate. They eat it because they like it.
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【判断题】制造业中采用的主要加工方法是金属加工。
A.
正确
B.
错误
【单选题】前照灯的反射镜应制成( )
A.
圆状
B.
楕圆状
C.
双曲线状
D.
旋转抛物面状
【单选题】前照灯的反射镜应制成( )。
A.
旋转抛物 面状
B.
椭圆状
C.
双曲面状
【单选题】复数 5i 2+i =(  )
A.
1+2i
B.
-1+2i
C.
-1-2i
D.
1-2i
【单选题】i是虚数单位, 5i 2-i =(  )
A.
1+2i
B.
-1-2i
C.
1-2i
D.
-1+2i
【单选题】如图所示是一个( )调节系统
A.
比值控制系统
B.
串级控制系统
C.
前馈控制系统
D.
定值控制系统
【单选题】前照灯的反射镜应制成()。
A.
旋转抛物面状
B.
椭圆状
C.
双曲线状
D.
圆状
【简答题】如图所示的系统,假设系统输入信号的斜坡输入x i (t)=at(式中a是一个任意常数,t≥0),试证明通过适当调节K i 的值,该系统对斜坡输入相应的稳态误差能达到零。
【简答题】某烃A的产量可以用来衡量一个国家的石油化工发展水平,A还是一种植物生长调节剂,A可发生如图所示的一系列化学反应,其中①②③属于同种反应类型.根据图回答下列问题: 根据如图回答下列问题: (1)写出D的结构简式:D______. (2)写出②⑤两步反应的化学方程式,并注明⑤反应类型: ②______ ⑤______(反应类型______ ).
【简答题】如图所示 , 图 A 为草原生态系统中的反馈调节示意图 , 请据图回答下列问题。 ( 1 ) 作为一个完整的生态系统 , 除了图 A 中所示的成分外 , 还应该包括 和 。 ( 2 ) 甲、乙、丙 3 者之间的食物联系是 ; 该生态系统的 是沿着这种渠道进行的。 ( 3 ) 图 B 为某湖泊的生态系统中发生的某种调节活动 , 这种调节导致的最终结果是加速 该生态系统原有的稳态。此结果产生的原因是 ...
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